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A distribution network lightning protection annular zinc oxide resistance sheet and its preparation method

A technology of zinc oxide resistors and zinc oxide, which is applied in the manufacture of resistors, resistors, varistors, etc., can solve the problems of low volume density of resistors, increased leakage current, and increased probability of zinc oxide particle fusion. Achieve the effect of improving flow capacity and mechanical strength, and improving uniformity

Active Publication Date: 2021-02-09
湖南防灾科技有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, with the increase in the amount of bismuth oxide, the potential gradient of the resistor sheet decreases significantly, and the leakage current increases (Acta Silicate, 2003, 31 (12): 1184-1187; Li Shengtao, Manufacture and Application of Zinc Oxide Varistor Ceramics, 2017 version)
This is because as the amount of bismuth oxide increases, on the one hand, due to the enhanced fluidity of zinc oxide particles in liquid phase bismuth oxide, the fusion probability of zinc oxide particles becomes larger, and the zinc oxide particles become larger than the grain boundaries under the same volume. On the other hand, due to the low melting point of bismuth oxide, it is easy to evaporate at high temperature, and a large amount of bismuth oxide evaporates, resulting in the generation of a large number of pores, making the volume of the entire resistor The density becomes lower, the internal microscopic defects increase, and the leakage current increases
Therefore, it is very difficult to prepare ring-shaped zinc oxide resistors with large flow capacity, small leakage current, and high potential gradient.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] In parts by weight, the raw materials of this embodiment include 90 parts of main agent, 6 parts of uniformity aid, and 4 parts of flux.

[0054] in:

[0055]In parts by weight, the main agent contains 89.9 parts of zinc oxide, 3.0 parts of bismuth oxide, 1.5 parts of cobalt oxide, 1.0 part of nickel oxide, 0.5 part of manganese oxide, 1.8 parts of antimony oxide, and the silicon-containing substance is 1.4 parts, 0.2 part of zirconia, 0.2 part of gallium oxide, 0.2 part of glass frit, and 0.1 part of aluminum nitrate. The silicon-containing material is ethyl silicate (liquid). The homogeneity aid is a combination of 40% zinc hydroxide, 30% bismuth hydroxide and 30% antimony hydroxide. The flux is glacial acetic acid.

[0056] The preparation process of the resistor sheet is as follows:

[0057] 1) Weigh zinc oxide, bismuth oxide, cobalt oxide, nickel oxide, manganese oxide, antimony oxide, ethyl silicate, zirconium oxide, gallium oxide, glass powder, aluminum nitra...

Embodiment 2

[0064] In parts by weight, the raw materials of this embodiment include 86 parts of main agent, 6 parts of uniformity aid, and 8 parts of flux.

[0065] in:

[0066] In parts by weight, the main agent contains 89.9 parts of zinc oxide, 3.0 parts of bismuth oxide, 1.5 parts of cobalt oxide, 1.0 parts of nickel oxide, 0.5 parts of manganese oxide, 1.8 parts of antimony oxide, and 1.4 parts of silicon-containing substances. , 0.2 part of zirconia, 0.2 part of gallium oxide, 0.2 part of glass frit, and 0.1 part of aluminum nitrate. The silicon-containing material is ethyl silicate (liquid). The homogeneity aid is a combination of 40% zinc hydroxide, 30% bismuth hydroxide and 30% antimony hydroxide. The flux is glacial acetic acid.

[0067] The preparation process of the resistor sheet is as follows:

[0068] 1) Weigh zinc oxide, bismuth oxide, cobalt oxide, nickel oxide, manganese oxide, antimony oxide, ethyl silicate, zirconium oxide, gallium oxide, glass powder, aluminum nit...

Embodiment 3

[0075] In parts by weight, the raw materials of this embodiment include 90 parts of main agent, 6 parts of uniformity aid, and 4 parts of flux.

[0076] in:

[0077] In parts by weight, the main agent contains 89.9 parts of zinc oxide, 3.0 parts of bismuth oxide, 1.5 parts of cobalt oxide, 1.0 parts of nickel oxide, 0.5 parts of manganese oxide, 1.8 parts of antimony oxide, and 1.4 parts of silicon-containing substances. , 0.2 part of zirconia, 0.2 part of gallium oxide, 0.2 part of glass frit, and 0.1 part of aluminum nitrate. The silicon-containing material adopts silica sol (liquid state). The homogeneity aid is a combination of 40% zinc hydroxide, 30% bismuth hydroxide and 30% antimony hydroxide. The flux is glacial acetic acid.

[0078] The preparation process of the resistor sheet is as follows:

[0079] 1) Weigh zinc oxide, bismuth oxide, cobalt oxide, nickel oxide, manganese oxide, antimony oxide, silica sol, zirconium oxide, gallium oxide, glass powder, aluminum n...

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Abstract

The invention relates to the technical field of high-voltage electrical sensitive ceramic materials, and specifically discloses a distribution network lightning protection annular zinc oxide resistance sheet and a preparation method thereof. The raw materials of the zinc oxide resistor include main agent, uniformity aid and flux, wherein the main agent includes zinc oxide, bismuth oxide, cobalt oxide, nickel oxide, manganese oxide, antimony oxide, liquid silicon-containing substance, zirconia, Gallium oxide, glass powder and aluminum nitrate. The present invention improves the raw material formula of the zinc oxide resistor and adopts an optimized preparation process to prepare a ring-shaped zinc oxide resistor, which improves the uniformity of the internal microstructure of the resistor and ensures a higher potential gradient and a smaller While leaking current, increase the flow capacity of the resistor sheet to more than 65kA.

Description

technical field [0001] The invention relates to the technical field of high-voltage electrical sensitive ceramic materials, in particular to a lightning protection annular zinc oxide resistor sheet for a distribution network and a preparation method thereof. Background technique [0002] The distribution network is the "last mile" of power supply, and operation safety is very important. First of all, compared with the main network, considering the investment cost and other factors, the distribution network lines mostly adopt the structure without lightning protection lines, which are prone to tripping and power outages during lightning, reducing the reliability of power supply. Secondly, lightning strikes can easily lead to disconnection of distribution network wires. When personnel approach the disconnection, it is very easy to cause electric shock casualties. Therefore, the research on lightning protection technology of distribution network is of great significance. [0...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01C7/12H01C17/30
CPCH01C7/126H01C17/30
Inventor 陆佳政陈宝辉谢鹏康王博闻方针胡建平
Owner 湖南防灾科技有限公司